The purpose of this study is to the improvement of the compatibility between polypropylene and bamboo fiber (BF), the extrusion appearance defect and odor problem due to the degradation of BF during melt processing of PP/BF composites. Finally, it is related to the preparation and physical properties of PP/BF composites for the development of materials applicable to automotive composites.
In Section III, the die temperature was changed from 210 ℃ to 240 ℃ and the screw rotation speed was changed from 100 to 300 rpm in order to select the optimal processing conditions considering the degradation of BF to produce PP / BF composites, Extruded appearance and physical properties were also evaluated according to the fiber length (50, 100, 200, 340, 1000 μm) and the BF content (10 to 25 wt%). The processing conditions were best evaluated at die-temperature of 210 ℃ and the screw rotation speed of 100 rpm, and a subsequent experiment was conducted under the selected extrusion processing conditions.
Second, the effect of BF alkali treatment on the chemical composition of hemicellulose and lignin, the improvement of compatibility between PP and BF and the degree of smell after extrusion processing were investigated. In addition, the optimum alkali concentration was selected by evaluating the physical properties according to the alkali concentration (NaOH 0.5 to 4%). The FT-IR measurement confirmed that lignin and hemi-cellulose are removed when the concentration of the Na OH solution reaches 1 % or higher. When the concentration of the NaOH solution is 3 %, the optimum mechanical properties were demonstrated and subsequent experiments were fixed at 3%.
Finally, CB5290 (MI = 100g / 10min) and BX3800 (MI = 30g / 10min) were mixed with each other to improve the mechanical properties and flow characteristics. The blend ratio was chosen as 50/50, taking into consideration the MI, complex viscosity and mechanical properties.
In Section IV, the effects of maleic anhydride (MAH) graft copolymer (PP-g-MAH, EOR-g-MAH) and silane coupling agent on the improvement of the compatibility between PP and BF and mechanical properties were investigated. The effect of ethylene octene copolymer (EOR) on the impact properties of PP/BF composites was investigated. Furthermore, the low molecular weight materials for odor of PP/BF composites were identified, and the improvement of odor problem for PP/BF composites were carried out with the addition of zeolite.